Skeleton Creek has a plot that's quite similar to a Scooby Doo episode, with the two investigators, Ryan and Sarah, playing the parts of Fred and Daphne. There's no Shaggy or Scooby equivalents: Ryan is a bit lacking in charisma.
The book is in the form of Ryan's journal - the typeface looks like writing, and there are various photographs and documents that he's pasted in as well. At intervals through the book, you're invited to go to his accomplice Sarah's website, and watch the videos she's sent to Ryan. These videos are essential to the plot, so you need internet access to read the book. I tried watching them on an iPod Touch, so I could read the book in bed, but the videos downloaded excruciatingly slowly from the website (they worked fine on a PC). Thankfully, all but one of the videos are also available as podcasts in the iTunes store (one is missing for technical reasons), so I could view them that way.
The plot concerns a ghost in an old dredge mining machine (a dredge is a floating machine with buckets that scoop up rock, pulverise it, separate out the metals and drop out the waste rock at the back) in rural Oregon, on the US West Coast. Some of the videos are set in this dredge at night, and are quite creepy without being too scary. There's a mystery to unravel, and the clues are presented in the text, in the pictures and in the videos. It's a little too contrived to make it easy to work out.
Skeleton Creek was published in two volumes in the US. The first volume there ended with an annoying cliffhanger; the UK edition combines both volumes, and the story comes to a satisfying conclusion. So if you want to find out who would have got away with it if it hadn't been for those meddling kids, you'll have to read - and watch - Skeleton Creek.